XP Power’s CCM250 is a new 250 W AC-DC power supply that achieves up to 95% efficiency, cutting the heat generated in medical, IT and industrial systems, and reducing or eliminating the requirement for heatsinks or fans for forced-air cooling.
Both conducted and radiated emissions are below Class B limits as defined by EN55011, an important consideration in achieving type approval for medical equipment.
The power supply delivers full output with convection cooling over input voltages from 90 to 275 V a.c., and 200 W from 80 V a.c., in ambient temperatures of
-10°C to +50°C. It measures only 152,4 x 101,6 x 39,1 mm, meaning that it fits in 1U enclosures. Where short-term peak power is needed, for example for motor start-up, the power supply will deliver up to 300 W for 500 milliseconds.
The units have a full feature set for controlling the supply and external monitoring and control equipment. This includes a 5 V standby rail, remote on/off switching and power fail signals. A 3-stage converter using an interleaved, resonant, half-bridge, means that two relatively small transformers can replace one large one, saving board space. A zero current, virtually lossless switching topology for the main converter ensures high efficiency over a wide load range and contributes to enhanced EMI performance. A crystal-controlled clock and digitally generated drive signals are used to ensure accurate, fixed-frequency timing for switching transistors. Heat-generating parts are bonded directly to the U-channel chassis, and magnetic components are conduction cooled, enabling the use of smaller parts.
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